Answer: Ultraviolet rays are a intense for of rays that normally you cant see, the sun emits uv rays, you stare at the sun you go blind, you tan in the sun too much, you may get skin cancer. Its the form of Radiation that causes it.
Answer: Yes they do. Plus they are safer most are capable of generating more heat that a solar cover. The effect is that Solar Sun Rings with 70% to 80% coverage outperform bubble pack covers with 100% coverage.
mark tahiliani (jm)
When does the 90o angle solar rays strike the Tropic of Cancer?